View source for Isofs transparent compression

{{FormatInfo
|formattype=electronic
|subcat=Filesystem
|released=1994
}}
''Mkisofs transparent compression'' is what we're calling a certain extension of [[ISO 9660]] format that supports per-file compression. It is designed as an extension of [[Rock Ridge]], characterized by the signature "<code>ZZ</code>". It is based on [[gzip]] format.

The only known software to support it are old versions of mkisofs/cdrtools, and patches that add support to the Linux kernel. It was apparently made obsolete by [[zisofs]] in 2001. There might be multiple incompatible versions of it.

== History ==
Transparent compression was new in mkisofs 1.1 (a.k.a. 1.01) (1994). Around 2001, mkisofs was incorporated into the cdrtools software. The feature was present in cdrtools 1.10 (2001). It was removed and replaced with [[zisofs]] support in cdrtools 2.0 (2002).

== Software ==
* [https://sourceforge.net/projects/cdrtools/files/mkisofs/old/ mkisofs (versions 1.05-1.13)]
* [https://sourceforge.net/projects/cdrtools/files/cdrtools-1.10.tar.gz/download cdrtools-1.10.tar.gz]
* http://www.dicosmo.org/FreeSoftware/isocompr/ - An old Linux kernel patch to support this format

[[Category:Compression]]